Telephone system.



Flimf WITNESSES} I PATENTED FEB. 5, 1907. R. M. BATON, TELEPHONE SYSTEM.

APPLICATION I'll-ED MAR. 30. 1904.

2 SHEETS-SHEET '2.

mil/ mg 7 FATE i GFFICEQ RICHARD M. EATON, OF PHILADELPHIA,PENNSYLVANIA, ASSiGNOR TO I KEYSTONE TELEPHONE CQMPANY, OhPHILiiDELPl'riL i, PENNSYL- VANIA, A QORPORATION OF NEW JERSEY.

TELEPHQNE SYETEM.

Specification of Letters Patent.

Patented. set ism.

Application filediMarcli 30, 1904, Serial No. 200,705:

To a-ZZ whom, it may concern:

Be it known that I, Rrcniinnlii. EATON, of Philadelphia, in the State ofPennsylvania, 2

have invented certain new and useful lm provements in Telephone Systems,whereof system comprising a line-circuit and apluas the express systezuand cluireetcii'lzed-' rality of groups of apparatus or stations com.-

mon to seid, linc-circuit, each station being provided with meanswhereby it may he operotively connected with the lnie-circuit and theien zunnig stat ons be conten'iporuneousl Y excluded from communicationwith said linecircuit. l v y My unproveinents may be advantageouslyapplied to a divided central telephone-exchange system comprisingdistinct switchboards which are interconnected by line-circuits, throughwhich the cells or orders are transmitted from one exchange operator toanother, with the result that on exchange operator is enabled to secureoperative connection with a selected idle line to the exclu sion ofother operators to whom that line is common. The delay and confusionincident to the attempts of so VQl'Ltl operators to secure possession ora line which is busy .is thus avoided, the fact that :rline is busybeing ninnii'ts'ted to the opcret or-seeliing possession of ithyi'uilure touiake connection therewith and without disturbance of thebusy line.

The form of my invention, hereinafter described, is perticule lydt'si'gned for enibotih merit in eoividcd centrsl telephone-exehnngearranged in nccordunce' with what is lnioirn by the errzorgcnrcnt ol thesuliscrihens-line terninels in independent groups respectively local todistinct swh ohbourds between which com" l'lliCtLliOIl is establishedthrough on an 'iliery' board by ILUQUIS ol' order or cull line circuitswhich extend iiOlll the other boards and tern ini'itc in s..itlauxiliary suitchhomd, where they may be connected by cord-circuits. itis to be lliltlclstOoil, however, thut i do not desire t o liar itmyself to suchemhodiruent cl my invention.

My invention conpxisps the v 1 features ol' voustriuuion uudltl'lztl'lgf-i:HUT hereinafter nLore delimit-1y specified and ious noveli In the accompanying drawings, Figure I is a,

diegrtnn of a telephone system showing one order or cell line circuit,which is connnon to four exchange-operators stations, the appsrzitusbeing in the normally idle position. Fig. 11 is s clisgrcnisiiniler toFig. 1, but show ing the position of the apparatus with one operzi'torsstation in connection with the line circuit and the other from.

to another switchboard distinct therefrom and comprising the four groupsof apparatus constituting the operators stations 3, 4, 5, and 6, whichstations are common to said line-circuit. In the particular embodimentspecified the board 2 is one of a series at which independent groups ofsubscribers lines, respectively, terminate, and the other board is anauxiliary board where the interconnections between subscribers terminalsof inherent groups are inane. it is to be understood that the number ofsaid stations is merely typical, ltllki that more or less may be not ian autonniticzilly-o ,ertttive electronmgnetic relay-switch 8 on; a,rnonuellywpera-tive S\Vi.lCll 10., Each of said nienuel switches 10 isoperatively related to the pair of switch-tcrininnls 12 of itslocel-ststiornmstruinent circuit, wluch circu..t lDCllL es the oerator's 1e civer or head telephone 13, the secondary of the operaittrsincuction coil 1 on i the shunt 15 to ground. The automatic SWiiUll. 8zit ouch of bltlu four stofions 3, 4, 5, mil (5 (JUIRiAZSGS threedistinct winnings or coils, one for such of the other stations, and thecircuit 18 connects all of said coils with the source of current 20,which letter is connected to ground at 2].. Said stations arerespectively provioel with'switch return-circuits 23, 24, 25,. andSZ-(i, and the return-oi cult for each station inuependently connectsthe corresponding coils oi: the switches S ell 3 incluthe correspondingCOilEl of the switches is at \hestetions 4,5, and 6, the return-circuit24 for the station =1 inclu .os the corresponding cols ol the switches Sthe 5 stations 3, 5, enzl' 6; the'return-circuit 25-for the station 5includes the corresponding coils tations excluded there In sziidfigures, 1 is as cell or orderline cir-f curt, which extends from theswitchboard 2' enroloyeti. Each of soul stations is proviuetl' the otherstations in parallel relation--thst is to say, the ret irinc' i'rruit 23for the station z of the switches 8 at stations 3, 4, and 6, and thereturn-circuit 26 for the station 6 ineludes the corresponding coils ofthe switches 8 at stations 3, 4, and 5. The switches 8 are operativelyrelated to the respective pairs of movable switch members 33, 34, 35,and 36, which are connected to the opposite the respective stations 3,4, 5, and 6. In the normaposition of the apparatus (shown in Fig. I)said switch members 33, &c., are maintained (by springs or, otherconvenient means) in connection with theirrespective switchreturn-circuits 23, 24,25; and 26 and in connection with their resective bridge-circuits 38. Each of said bridge-circuits 38 comprises aair of switch-terminals 39, disposed in osition to connect wit theterminals 12 their respective local-instrument circuits upon operationof the respective manual switches 10. v y a The apparatus is operated asfollows: The line 1 being iule and the ap aratus in the normalposition(shown in Fig?) the operator at station 4 may secure exclusive controlof said line for communication with the operator stationed at theswitchboard 2 by depressing theswitch of station 4, as indicated in Fig.II. The aforesaid manipulation of the switch 10 bridges thelocal-instrument cir. cuit at station 4 across the'line 1, through thecontacts of the switch-terminals 12 with the switch-terminals 89, andcontemporaneously establishes connection from the through the shunt 15,extending from the local-instrument circuit of station 4. The effect oflish a current from the source 20, through the 6 corresponding coils ofthe-switches 8, at each i of the'stations 3, 5, and' 6, which coils thereturn-wire 24 of station 4 connects in parallel "relation, thevautomatic switches 8 of Sta tions 3, 5, and 6 being1 thus energized inep- 4 5 erative relation with t e switch'members 33, 35, and 36. Saidmembers are each Withdrawn to the position shown in Fig. II, thisbreaking their normal connection with the respective bridge-circuits 38and excluding said stations 3, 5, and 6 from communication with theline 1. The shifted position of the switches 8 (shown in Fig. II) ismaintained by the current from the source 20 until the switch 10 ofstation 4'is restored to its nor; mal position, Fig.I,) whereupon the 55 (shown in circuit including the return-wire 24 and the coils of therespective ante corresponding matic switches 8 is broken by theseparation ..f the switch-terminals 12 and 39, an:l the switch members33, 35, and 36 are restored to their normal position. It is to beunderstood that any one of the other operators stations which are commonto the line-circuit 1 may obtain exclusive control of said line 05 whenit is idle by manipulation of the respecsides-of the line-circuit 1 atswitch return-circuit 24 to the groundthe latter connection is toestabtive switch '10, and consequent" automatic operation of therespective switch 8 in the manner 'sai'd line-circuitl is busy, inconnection with any one station of the series which is common .to it,the operators at the remaining stations cannot interfere with theestablished connection; but a busy testis manifested to an operatorattempting to make connection wit 'nection. 4

Althnu h I have shown my improvements asapplie 'to a telephone-exchangesystem of a articular type, it is to be understood that 'do not desireto limit myself to such an embodiment of my invention, as myimprovements are applicable to any electricwir' system comprising aline-circuit and a plum ity of stations common cuit. Moreover, it is tobe understood that I do'not ,desire to limit myself to the recisedetails of construction herein set fort asit is obvious that variousmodifications may be made therein without departing from the essentialfeatures of my invention.

I claim j 1'. In a telephone system, the combination with aline-circuit; of a pluralit of stations common to said line-circuit; eacstation being provided with an automaticswitch, each comprising adistinct coil for each of the other statlons; a circuit switch-coilswith a source of electric current;

arranged to bridge its station across the lineautomatic switches at theother stations, to exclude the latter from connection with saidline-circuit, substantially as set forth.

2. In a telephone system, the combination with a line-circuit; of aplurality of stations common to said'line-circuit; a local-instrumentcircuit at each station, comprising a receiver, an induction-coil, and ashunt to ground; an automatic switch-coil at each station, operativelyrelated to distinct switch members respectively connected posite sidesof said line-circuit; and, a manual switch at each station, arranged toconnect its local-instrument circuit in a bridge eusly operate theautomatic switches at the other stations; whereby, the selected staticnis operatively connected with. said linecircuit, and the remainingstations are contemporaneously excluded from connection with said.line-circuit, substantially as set ant...

with a line-circuit; of a plurality of stations common to saidline-circuit; a local-instrument circuit at each station, comprising areceiver, an induction-coil, and, a shunt to ground; an

at each station,

operatively related to disabovedeseribed. It is to be noted that when,

said line-circuit by failure to effect such con-.

to said line-cirand a manual switch at each of said stations;

circuit and close the circuit including said to the op-- across saidline-circuit and contemporaries-'- connecting all of said Inatelephonesystem, the combination automatic relay switch-coil nected tothe opposite sides '0 said line-ciremit; a source of electric energycommon to all of sald automatic switch-coils; and, a

manual switch at each station, arranged to connect its local-instrument"circuit in a bridge across sald line-circuit and contemporaneously ocrate the relay-switch memers at the ot ier stations; whereby theselected station is operatively connected with said line-circuit and theremaining stations are contem oraneously excluded from eonnection'witsaid line-circuit, substantially as set'forth.

4. In a telephone system, the combination with a line-circuit; of aplurality of'stations common to said line-circuit, each comprising aninduction-coil; automatic relayswitches respectively located at saidstations; each comprising a magnet-coil; a circuit connecting all ofsaid switch-coils with a source of electric current; return-circuitsnecting the corresponding coils of all of the other switches inoperativerelation; and, a

manual switch at each of said stations operatively related to theautomatic switches at the other stations, substantially as set forth.

5. In a telephone system, the combination with aline-circuit; of aplurality of stations common to said line-circuit; counter art automaticswitches respectively locate at said stations; each comprising adistinct coil for each of the other stations; a circuit'connecting allof said switch-coils with a source of electric current; return-circuitsequal in number to said switches, the return-circuit for each switchindependently conmeeting the corresponding coils of all of the otherswitches in parallel relation; and, a manual switch at each of saidstations operativel related to the automatic switches at the ot ierstations, substantially as set forth.

